GSXR is SuzukiOK Im thinking now it was probably a modded GSXR as it did look like a Kawi and I do admit I only caught a fleeting glimpse of it. I saw you can get a 240 tire in some kits...it wasn't heavily extended though.
Another "I Saw You" on Cawthra at 403 at that moment.....a Yammy Tracer 900 with a Kawi top case, WTF......oh wait, that was me....